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How do I know if my fuel pump is bad?

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Old 01-06-2019, 11:36 PM
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Default How do I know if my fuel pump is bad?

Sorry for stupid question..
I have got one -99 XJ8 Vandenplas, with no start..
I checked the spark, and it gets good power/sparks
But I checked the inertia valve, NO FUEL PRESSURE
New battery
Checking the trunk fuses, fuel pump 7 gets power while cranking, not the 15 (but that one is for the Supercharged, right?)
Cannot hear and "clicking" on the relay..
Still no fuel up in the engine room, and no noise from any pump..
What do I do next?
Thank You

Sorry if this is a old thread, but I could not find anything directly like mine..
I found how to change pump and so, but I want to know if it is bad before changing
Glenn
 
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Old 01-07-2019, 04:25 AM
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The # 16 / 10 amp LH heelboard fuse closes the pump power relay

In order for the fuse to have power the Ignition Positive Relay must close

It is located in the corner of the fuse holder that holds the other 18 fuse and can be swapped for testing purposes with the RH heelboard fuse holder relay
 

Last edited by Lady Penelope; 01-07-2019 at 04:49 AM.
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Old 01-07-2019, 12:51 PM
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Editing with some additional information left out earlier , I had a appointment

If you put your finger on the # 1 relay it will click on for 4 seconds then click back off as you rotate the key to the on position before the start position

The relay will click back on with a 3rd click as the engine ECU sees engine rotation and will stay on for the duration of the drive

This is a safety design

There is also a safety design feature of a crash switch that when tripped for whatever reason prevents the pump from running

You would have to put your finger on the specific relay as there are others in the area that will click in the starting sequence

Battery fully charged state of 12.75 volts

As the battery drains down there is not enough voltage to run the ECU properly , this prevent the fuel injectors from delivering fuel to the cylinders

A condition called bore wash can accure if unburned fuel washes the very thin oil film off the cylinder walls . This prevents the cylinders from having enough compression for a sustained engine light off

This can be fixed by a sequence of starter rotation with the gas pedal to the floor . By design this will cut off the fuel being delivered to the cylinders and on the underside of the pistons some new oil will recoat the cylinder walls for better compression later when you relax the gas pedal

Nickasol condition for the AJ26 engine for the 98 - 99 year production , Need to determain if you have the swapped out later AJ27 engine before going into detail

Editing complete and running errands so someone else can get you going
 

Last edited by Lady Penelope; 01-07-2019 at 01:42 PM.
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Old 01-07-2019, 10:49 PM
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Whatever I did or measured, no start of pump..
So I started to take the tank out, for checking the pump, ..aaand it smells lie kerosene! Tank not out yet, but already I guessing this Jag has been standing for a longer time..
So I guess the pump is shoot, or so..
Lets see what's hiding in there..
I had to gave upon my driveshaft was disconnected, the fuel line tool I had, was no way to get it off, I making me a tool tomorrow or some other day..
Everything in the trunk is done, just the making of a tool left to do..
I saw somewhere here a homemade tool of some pipe for toilets that worked!
But I thinking about to buy some water lines, or some other plastic pipes, to make it from..
 
  #5  
Old 01-09-2019, 12:42 AM
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Anyone know what brand/model that is the OEM fuel pump?
 

Last edited by theswede; 01-09-2019 at 12:43 AM. Reason: wrong spelled
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Old 01-09-2019, 01:08 AM
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Or does anyone have recommendation on aftermarket pumps?
If so, what brand, and why it can be good?
Airtex, Denso, Bosch, Delco etc..? And Model No?
 
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Old 01-14-2019, 10:14 PM
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Default I think I know the reason..

I think I know the reason now!! Why I didn't get and fuel, and why I could not get the pump to start...
I smelled like kerosene and all grommets and plastics was eaten up totally
Ethanol!!
Why in the *&^% do the government force Us to use this bi-product that just damages vehicles etc..!????
Oh well, they earn money on a product they have to pay to get rid off otherwise...
The car had been parked for some years, but this is ridiculous



 
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Old 01-14-2019, 10:27 PM
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Me again..
So how do I find the hoses, and the grommets for the fuel pump hole and the level sensor hole? One of the fuel pump hoses had a "back" valve too that is garbage.
I checked the Barrat catalog, but nope, no info there..
 
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Old 01-15-2019, 12:41 AM
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Check this area and note your model year :

https://www.jaguarclassicparts.com/u...tems/fuel-tank
 
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Old 01-15-2019, 09:06 AM
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Thank You, thu that website did not let me see anything..
I click and the side to choose what vehicle comes up, but once clicking, it seems like it does an attempt to open , but closes immediately.. just lets me get a glimpse of a millisecond of the page..
 
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Old 01-15-2019, 09:16 AM
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I ordered one BOSCH fuel pump, that I hope is an OEM pump, or OEM alike.. I just seems to trust BOSCH more than some others out there, hope that I am not wrong
I might/should bought to high pressure one from the Super charged Jag instead.. :/
Ok, so I and scrolling around to try to buy the items in the tank, with no really success..
I what to get all the parts for the inside the tank, such as clamps, hoses, the little filter for the return, the return hose, grommets and the fuel line attachments in the bottom for the feeding/return line etc...
This tank was a pian in the butt to get out, in the garage floor and on jack stands..
But it came out, and now I want to make it RIGHT!
Change everything so I NEVER need to get it out once more!
 
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Old 01-15-2019, 09:17 AM
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"..little filter for return"..
That is the back valve I assume..
 
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Old 01-15-2019, 09:22 AM
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Click on the far right column to see the specific item
 
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Old 01-15-2019, 08:59 PM
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That worked
 
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Old 01-15-2019, 09:11 PM
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Default Back valve and discontinued parts

Still I have not found what I needed..
I was even at the Jaguar dealer but they said that the "in tank" hoses is discontinued, and they did not know about that "back valve/filter" I got in the incoming fuel line/return.. And that hose was really some kind of special, one size on the incoming side and a smaller on the other, and that is where I got that "back valve"
That hose "is no more"..!
So I have to fab something..
But hey, what do I do about "My back valve"?
Skip it?
It definitely looks like original, no "extra fix thingy".. I don't believe anyone has been in there since the car was assembled at Jaguar.. :/
So I can get hold of hose NO: 6 but not the "other" with the "back Valve"
Well, I might just buy 2 No 6 and "fix" that other side somehow
My plan is to get all stuff in tank, NEW! And as OEM, as possible or better
 
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Old 01-16-2019, 09:36 AM
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Anyone has a drawing from All stuff on the inside tank?
On Jaguar or Barratt etc they just shows some of the parts, not actually what's in there..
 
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